How can you switch your Playstation Network account from one email to another?

The sign-in IDs cannot be identical for different PSN accounts. However, if you use Gmail you can add an extension on to the end of your email name by using a (+), thus allowing you to use the same email address for multiple PSN accounts. For example, if your email address is (yourname@gmail.com), you could use (yourname+psn1@gmail.com) and (yourname+psn2@gmail.com). This will make your PSN sign-in IDs different while allowing you to use the same email address.